It may be caused by bad habits, such as unconscious picking of the nostrils, or by genetic factors. Exposed nostrils do not affect the patient’s health, but mainly affect the patient’s appearance, which may cause an unattractive appearance. If the patient’s nostrils are large on both sides, the nostrils will also be larger and cause them to flare out. It is recommended that patients undergo nasal reduction surgery. During the surgery, the mucous membrane on both sides of the nose can be removed and then sutured. After nasal reduction, the nose will become more firm and clear, and will look more beautiful.